Re: [PATCH v2 2/2] git-p4: handle "Translation of file content failed"

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On 15/09/15 16:38, Lars Schneider wrote:

On 15 Sep 2015, at 08:43, Luke Diamand <luke@xxxxxxxxxxx> wrote:



Do we know the mechanism by which we end up in this state?
Unfortunately no. I tried hard to reproduce the error with “conventional” methods. As you can see I ended up manipulating the P4 database…

However, it looks like this error happens in the wild, too:
https://stackoverflow.com/questions/5156909/translation-of-file-content-failed-error-in-perforce
https://stackoverflow.com/questions/887006/perforce-translation-of-file-content-failed-error

It's described in the Perforce FAQ here:

http://answers.perforce.com/articles/KB/3117

i.e. it looks to be caused by mixing old and new P4 clients.


Known issue: This works only if git-p4 is executed in verbose mode.
In normal mode no exceptions are thrown and git-p4 just exits.

Does that mean that the error will only be detected in verbose mode? That doesn't seem right!
Correct. I don’t like this either but I also don’t want to make huge changes to git-p4.
You can see the root problem here:
https://github.com/git/git/blob/97d7ad75b6fe74960d2a12e4a9151a55a5a87d6d/git-p4.py#L110-L114

Any idea how to approach that best?

I guess what we have is not ideal but probably good enough.


+            try:
+                text = p4_read_pipe(['print', '-q', '-o', '-', '%s@%s' % (file['depotFile'], file['change'])])
+            except Exception as e:

Would it be better to specify which kind of Exception you are catching? Looks like you could get OSError, ValueError and CalledProcessError; it's the last of these you want (I think).
I think it is just a plain exception. See here:
https://github.com/git/git/blob/97d7ad75b6fe74960d2a12e4a9151a55a5a87d6d/git-p4.py#L111

OK, you're right (probably less than ideal behaviour from read_pipe() and die() but let's not try to fix that).


+                if p4_version_string().find('/NT') >= 0:
+                    text = text.replace('\r\n', '\n')
+                contents = [ text ]

The indentation on this bit doesn't look right to me.
I believe it is exactly how it was:
https://github.com/git/git/blob/97d7ad75b6fe74960d2a12e4a9151a55a5a87d6d/git-p4.py#L2397-L2399

OK.



In general, what is the appropriate way to reference code in this email list? Are GitHub links OK?

I'm not an expert, but it feels possibly a bit ephemeral - if someone is digging through email archives in a future where that github project has been moved elsewhere, the links will all be dead.

Luke
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